Thread chasing or cleaning tool



R. s. WILLIAMS THREAD CHASING OR CLEANING TOOL 2 Sheets-She s; 1

Filed Feb. 2.1, 1925 Jul 13 1926. 1,592,245 a R. s. WILLIAMS THREAD CHASING OR CLEANING 'IOOL Filed Feb. 21, 1925 2 Sheets-Sheet 2 Z y 4M /6 n n. I?! a 5 Patented duly l3, i925.

tr stares RUBERT S. WILLIAMS, IRVINE, KENTUCKY, ASSIGNGR OF ONE-FOURTH TOTEIOMAS A. CEIRISTOPHER AND ONE-FOURTH TO FRAEGIE J. STEVENS, OF IRVINE, KEN- TUCKY.

THREAD CHASING OR CLEANING TOOL.

Application filed February 21, 1935. Serial No. 10,931.

My invention relates to improvements in devices for either chasing or cleaningscrew threads, and the device is intended primarily for use in connection with locomotive or other plugs. Heretofore, it has been customary to perform the work on the plugs, byineans of a lathe, requiring considerable time in placing, centering, and cutting with a thread chasing tool. It is the ob ect of my invention however to provide an extremely simple and inexpensive device which will perform the desired work in less tune and with less trouble, about one-eighth of the time usually necessary with a lathe, being required when my invention is used.

With j the foregoing in view, the invention resides in the novel subject matter hereinafter described and claimed, the description being supplemented by the accompanying drawings;

Figure 1 is an elevation of the invention with parts broken away. 7

Figure 2 is a sectional view on line 2-2 of Fig. 1.

Figures 3, 4t and 5 are detail sectional views as indicated by lines 33, H and 55 of Fig. 2.

Figures 6 and 7 are detail sections as indicated by lines 66 and 77 of Fig. 1.

in the drawings above briefly described, the numeral 1 designates a cup-shaped head which is preferablyprovided with a shank 2, said shank being adapted to be fixedly held in any suitable manner. At its open end, remote from the shank 2, the head 1 is provided with an outstanding annular flange 3 at right angles to the axis of said head, said flange having a stepped outer side, which sidecomprises inner and outer concentric steps 4 and 5, "and an annular outwardly facing shoulder 6 at their junc V ture. p

I The flange 3 of the head 1 is provided in its stepped side, with radial guideways, and each of these guideways preferably consists of an inner radial groove 7 formed in step 4, an outer radial groove 8 formed in step 5, and a notch 9 connecting the two grooves. Die-carrying members are disposed in the guideways 78 9, and each of these members by preference comprises a rod 10 passing through the notch 9 and provided at its outer end with a flat rectangular head 11 which is slidable in the outer groove 8, the outer side of said head being flush with the step 5, while the inner side of said head is spaced from the .bOttOHLlQ of this groox-e. The last named side of the head preferably engages guide shoulders 13 formed longitudinally in the groove 8. threaded or otherwise connected with the inner end of each rod 10, and slidably received in the inner groove 7, is a die 14, one edge of this die being in slidable contact with the bottom of the groove, while its opposite edge is flush with the step 4. By preference, coiled compression spring 15 surrounds each rod 10 with one end in contact with the die 14 andits other end in contact with the outer end wall of the groove '4", so that the several springs exert their power to normally force the dies and their carrying-members inwardly.

A flat, circular, scroll or cam plate 16 rests upon the shoulder 5 andis rotatable about the shoulder 6. In the preferred form of construction, this plate is formed with cam slots 17 which receive portions of bolts or the like 18 connected with the heads 11, so that rotation of the scroll plate will simultaneously move all of the die-carrying members and the dies 14 inwardly or outward-- ly as occasion may demand. The bolts 18 may well be shouldered to prevent their heads from binding tightly against the scroll plate 16, and the nuts 19 of said bolts are received in the inner portions of the grooves 8, that is the portions of these grooves adjacent their bottoms 12. Opposite sides of these nuts preferably engage the parallel groove walls, so that said nuts are held against dislocation.

An annular cap plate 20 is secured by screws 21 against the step 4, the peripheral edge of this can plate being by preference provided with a lateral flange 22 which surrounds the shoulder 6 and laps onto the inner portion of the scroll plate 16. Thus, the plate 20 holds the plate 16 in proper place and also retains the dies and their carrying members within the guideways. The two plates 16 and 20 jointly extend over all of these guideways, so that they are covered and thus protected against all sorts of foreign matter.

Forturning the scroll plate 16, this plate is provided with an appropriate lateralhandle 23, and to retain said scroll plate in any position to which it is adjusted, an appropriate pawl 2% may be mounted on the plate to engage any of a series or" notches in the peripheral edge of the plate 20. Preferably, the pawl 2% is slidably mounted between appropriate guide ribs or the like 26, is provided with a spring 27 which normally projects it, and is formed with a linger-piece 28 by means of which it may be re racted. The screw 29 shown in Fig. (5 may well be employed to hold the pawl 2% properly positioned between the guides 26, the head of said screw being slidably received in a slot 30 in the plate 16.

By releasing the pawl 2-l and turning the scroll plate 16 in the proper direction, the dies may readily be adjusted to the work and all material removed from such work will be caught in the recess 31 forming the interior of the head 1. This head is preterably provided with a plurality of openings 32 through which the material received therein may discharge.

It will be seen from the foregoing that an extremely simple and inexpensive, quickly and easily adjusted, rapid and eliicient tool has been provided. Moreover, quick and easy changing of dies may he etl'ccted, as reinoval'ot the cap plate 20 will permit the dies 14-, rods 10, and scroll plate It: to be removed as a single unit. The dies may then be easily removed and others substituted.

As excellent results are obtainable from 'tlheconstruction shown, it may well be followed, but within the scope of the invention as claimed, modifications may be made.

l. A thread chasing or cleaning device comprising a circular head having a central recess. said head being provided with a stepped side at right angles to its axis, said stepped side comprising inner and outer concentric steps and an annular outwardly 't'ac 'ing shoulder at the juncture of said steps; said head being formed with radial guideways in its stepped side leading to the atoresaid recess and each comprii' a radial groove in the inner step, a radial groove in the outer step, and a notch connecting the inner and outer grooves; die-carrying menib'ers passing through the notches ot the aforesaid guideways and having ltat heads slidably received in the outer grooves, the outer sides of said heads being flush with the aforesaid outer step, a cam plate resting on said outer step and extending across the outer grooves, said cam plate being rotatable about the aforesaid shoulder and having cam slots, bolts passing through said cam slots and the aforesaid heads, said bolts having nuts on their inner ends disposed in said outer grooves and engaging the side walls of the latter whereby the nuts are held against removal, dies carried by the inner ends of the aforesaid die-carrying members and slidably engaging the walls of the aforesaid inner grooves. and an annular cap plate secured to the above-named inner step and extending over said inner grooves, said cap plate having its peripheral portion disposed in overlapping re ation with the inner portion of said cam plate, whereby to hold the latter and associated parts in op rative position.

2. A thread chasingor cleaning device comprising a circular head having a central recess, said head being provided with a stepped side at right angles to its axis, said stepped side comprising inner and outer concentric steps and an annular outwardly 't'acing shoulder at the juncture of said steps: said head being ii'ornied with radial guideways in its stepped side leading to the aforesaid recess and each com 'irising a radial groove in the inner step, a radial groove in the outer step, and a notch connecting the inner and outer grooves: die-carrying stems passing through the notches ot the aforeiaid guideways and having heads slidably 'eceivcd in the outer grooves, dies carried iy the inner ends of said stems and slidably positioned in the inner grooves, coiled compression springs surrounding said stems in the inner grooves and engaging said dies and the inner ends of the inner roovr-s, a cam plate resting on said outer step and extending across the outer grooves, the aforesaid heads having project-ions engaging cams of said plate, and an annular cap plate secured to the above-named inner stop and extending over said inner grooves, said cap plate having its peripheral portion disposed in overlapping relation with the inner portion of said cam plate to hold the latter and associated parts in operative position.

In testimony whereof I have hereunto a lfixed my signature.

ROBERT S. \VILLIAMS. 

